Combustion of Shale Heavy Coal-Tar Products in a Boiling Layer of a Catalyst
N. A. YAZYKOV1, A. D. SIMONOV1, A. S. AFLYATUNOV1, YU. V. DUBININ1, S. A. SELISHCHEVA1, V. A. YAKOVLEV1, A. I. STEPANENKO2
1Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Gormasheksport JSC, Novosibirsk, Russia
Keywords: shale fuse, catalyst, boiling layer, combustion
Pages: 313-321
Abstract
The work studied the catalytic combustion of heavy coal-tar products (HCTP) formed upon processing of Baltic shales to assess the efficiency of combustion in the presence of an Al-Cu-Cr oxide catalyst of complete oxidation of organic compounds with active component contents of 10 %, the optimum temperature modes of catalytic combustion were determined and an assessment of an opportunity for carrying out fuse combustion process in a boiling layer of a catalyst without using additional fuels was performed. It was demonstrated that the maximum degree of combustion of 97.7-97.8 % was reached at 700-750 °С. Herewith, the concentrations of harmful substances in exhaust gases were the following: СО 244-269 ppm; NOx 179-229 ppm; SO2 - is absent. Based on the literature data on catalytic combustion of oil containing sulphur, it was demonstrated that the SO2 concentration at the outlet of the reactor could reach the value of 60 ppm during long-term operations of the setup for catalytic combustion of HCTP in autothermal mode considering the calcium oxide content in their mineral component. The carbon content in bottom ash amounted to 2.3-2.4 %. By the calcium oxide content, ash refers to basic fly ash and can be used as an additive to cement. Based on the results of catalytic combustion of HCTP in autothermal mode in a laboratory setup, emission of harmful substances in exhaust gases was determined using HCTP as fuels for a catalytic boiler-house with the air excess coefficient α = 1.2.
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